Step1: Standing on a piece of paper

Step2: Mark the heel and the longest toe with a pen

Step3.:Measure the distance with a ruler

 size 29, fit for feet length 17 cm

 size 30, fit for feet length 17.7 cm

 size 31, fit for feet length 18.4 cm

 size 32, fit for feet length 19 cm

 size 33, fit for feet length 19.6 cm

 size 34, fit for feet length 20.3 cm

 size 35, fit for feet length 21 cm

 size 36, fit for feet length 21.7 cm

 size 37, fit for feet length 22.4 cm

 size 38, fit for feet length 23 cm

Insole length = foot length + (0.5-1.5)CM